Ok, I apologize for wasting everyone's time. What I was actually asking was:
"WHY would a TBI systems get better results than an MPFI system, when I've seen stated so often that the reverse should be the situation?"
So, simply the larger stroke and factory tuning within the ECU being biased...
Well, a DI conversion is something that not only was I not planning on, but also something that would be very costly. My experiment is to so what mechanical alterations I can make to the cylinder head (and possibly the intake as well) to increase the MPG figures and document the real-world...
For instance, do both engines have the same compression ratio.
9.1:1 on the DX vs. 9.2:1 on the Si I believe.
Do they have the same exhaust system.
Quite certain that they do.
Do they have the same amount of valve overlap.
This I would have to check into.
For instance, do both engines have the same compression ratio.
Do they have the same exhaust system.
Do they have the same amount of valve overlap.
Does the inlet manifold feed equal air to each cylinder.
The Si uses a log-style manifold while the runner length appears to be nearly equal on...
Well, besides the body (hatchback) being identical I don't see how much of the aerodynamics could have varied by much.
Pat...which way are you leaning?
Within the next few months I'll be switch the system over to a later style ECM and have the ability to tune it infinitely on the fly with a...
Well, at the time with my Si, I had the same size steel wheel as I do now on the DX. Brand of tires I do not recall, I did not have the Si wheels.
Final drive on the Si appears to be 4.25 vs. the DX having a 3.89 with 1-5 gear ratios being the same. I still do not agree with how the MPFI...
Well, I can see how MPFI could make it easier to achieve a higher HP figure, but assuming one were to never go WOT and keep it to a light cruise for the best fuel efficiency, I have read numerous times (even on here at least once) that a MPFI system would ALWAYS provide better fuel economy over...
Based upon the question in the subject, which fuel injection arrangement would you expect to yield best results for fuel efficiency?
I'm going to leave this open for discussion, then I'll post the results that I have come across on more than one occasion.
Hemi,
Similar to how the impact of a bullet is measured in pounds while it only weighs a few ounces, the reciprocating motions of valve train components are measured the same way. I work for Ferrea Racing Components in sales/tech, and have this conversation quite often. We use the term...
Hemi,
Something else to take into consideration is the RPM at which the valve train would normally start to bounce/ become unstable. If your valve were to go "unstable" at "X" RPM, then having 25 pounds of pressure to force the valve open would be equivalent to removing 25 pounds of spring...
